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Formula
Calculate the value
Answer
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$- \sqrt{ -9 }$
$- 3 i$
Calculate the value
$- \sqrt{ \color{#FF6800}{ - } \color{#FF6800}{ 9 } }$
$ $ Organize the part that can be taken out of the radical sign inside the square root symbol $ $
$- \left ( \color{#FF6800}{ 3 } \sqrt{ \color{#FF6800}{ - } \color{#FF6800}{ 1 } } \right )$
$- \left ( 3 \sqrt{ \color{#FF6800}{ - } \color{#FF6800}{ 1 } } \right )$
$ $ It is $ \sqrt{-1} = i$
$- \left ( 3 \color{#FF6800}{ i } \right )$
$\color{#FF6800}{ - } \left ( \color{#FF6800}{ 3 } \color{#FF6800}{ i } \right )$
$ $ Get rid of unnecessary parentheses $ $
$\color{#FF6800}{ - } \color{#FF6800}{ 3 } \color{#FF6800}{ i }$
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